TECH ST-408, User Manual, Page: 8 / 28

ST-408 – user's manual
III.b) Valve 2
In this submenu, a user sets the basic parameters of the first valve, the same
as for valve 1 settings.
III.c) HUW pump (boiler pump)
This function is used to set HUW pump working parameters.
III.c.1) HUW preset temperature
With this function, the preset temperature of utility water is set; The
temperature can be also changed directly from controller main screen , when
HUW view is active. After heating water in the boiler up to this temperature,
the regulator deactivates HUW pump. The pump will be re-activated when the
temperature decreases below the value set by
HUW hysteresis parameter
value.
III.c.2) Operational modes
This function allows for a complete deactivation of HUW pump, if it is not
used, or for the activation of automatic operation (then it works according to
the settings included in this chapter).
III.c.3) HUW hysteresis
This option is used to set the hysteresis of the preset boiler temperature.
This is a difference between the preset temperature (that is, the one required
at the boiler) and the temperature of returning to work (for example: when
the preset temperature has the value of 55°C and the hysteresis is 5°C. After
reaching the preset temperature, namely 55°C, HUW pump shuts down. HUW
pump will be re-activated when the temperature decreases to 50°C).
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